diff --git a/lib/MSP/msp.cpp b/lib/MSP/msp.cpp
index 9fe5960..ff1ac10 100644
--- a/lib/MSP/msp.cpp
+++ b/lib/MSP/msp.cpp
@@ -31,6 +31,10 @@ uint8_t crc8_dvb_s2(uint8_t crc, unsigned char a)
     return crc;
 }
 
+MSP::MSP() : m_inputState(MSP_IDLE)
+{
+}
+
 bool
 MSP::processReceivedByte(uint8_t c)
 {
diff --git a/lib/MSP/msp.h b/lib/MSP/msp.h
index 7637ee8..db51b06 100644
--- a/lib/MSP/msp.h
+++ b/lib/MSP/msp.h
@@ -88,6 +88,7 @@ typedef struct {
 class MSP
 {
 public:
+    MSP();
     bool            processReceivedByte(uint8_t c);
     mspPacket_t*    getReceivedPacket();
     void            markPacketReceived();